Observation of Anderson Localization in an Electron Gas

Given that more than two thirds of all energy is lost, mostly as waste heat, in utilization processes worldwide, thermoelectric materials, which can directly convert waste heat to electricity, provide an alternative option for optimizing energy utilization processes. After the prediction that superlattices may show high thermoelectric performance, various methods based on quantum effects and superlattice theory have been adopted to analyze bulk materials, leading to the rapid development of thermoelectric materials. Bulk materials with two‐dimensional (2D) structures show outstanding properties, and their high performance originates from both their low thermal conductivity and high Seebeck coefficient due to their strong anisotropic features. Here, the advantages of superlattices for enhancing the thermoelectric performance, the transport mechanism in bulk materials with 2D structures, and optimization methods are discussed. The phenomenological transport mechanism in these materials indicates that thermal conductivities are reduced in 2D materials with intrinsically short mean free paths. Recent progress in the transport mechanisms of Bi2Te3‐, SnSe‐, and BiCuSeO‐based systems is summarized. Finally, possible research directions to enhance the thermoelectric performance of bulk materials with 2D structures are briefly considered.

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“…The first mech anism involves an increase in the density of states (DOS) near the Fermi level. According to Mott's relation: [81] …”

Section: Strategies From Artificial Superlatticesmentioning

confidence: 99%

Promising Thermoelectric Bulk Materials with 2D Structures

2017

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“…Indeed the longitudinal conductivity of itinerant two-dimensional to Fermi statistics with lowering energy across the mobility edge because of the Coulomb repulsion of bosons in localised states [72]. Hence one can use the same expansion near the mobility edge as in ordinary amorphous semiconductors to obtain the familiar textbook result S = S 0 T with a constant S 0 at low temperatures [73]. The model becomes particularly simple, if we neglect the localised carrier contribution to ρ, Θ and α xy , and take into account that α ext xy ∝ B/ρ 2 and Θ ext ∝ B/ρ in the Boltzmann theory.…”

Section: Some Normal State Properties Of Cuprates In Fcm a Normmentioning

confidence: 99%

Bose–Einstein condensation of strongly correlated electrons and phonons in cuprate superconductors

Alexandrov

2007

J. Phys.: Condens. Matter

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“…1 On the one hand, Slonczewski [32] developed an analytical model for describing the TMR in ferromagnet/insulator/ferromagnet MTJs. On the other, Mott derived a relation between the thermopower and the energy derivative of the conductance for low temperatures [33,34]. In this paper, we derive analytical expressions for both the thermopower and the TMT by combining Slonczewski's model with Mott's relation.…”

Section: Introductionmentioning

confidence: 99%

Tunneling magnetothermopower in magnetic tunnel junctions

2014

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Thermally induced spin-dependent transport across magnetic tunnel junctions (MTJs) is theoretically investigated. We analyze the thermal analog of Slonczewski's model (as well as its limiting case-Julliere's model) of tunneling magnetoresistance and obtain analytical expressions for the junction thermopower and the tunneling magnetothermopower (TMT). The analytical model is tested numerically for the special case of an Al 2 O 3 -based MTJ, for which we analyze the dependence of the thermopower and TMT on the relative magnetization orientations, as well as on the barrier height and thickness. We show that at a certain barrier height TMT vanishes, separating the region of positive and negative TMT. As its electrical prototype, this thermal spin transport model should serve as a phenomenological benchmark for analyzing experimental and first-principles calculations of thermopower in magnetic tunnel junctions. The analytical expressions can be used as a first estimate of the magnetothermopower of the junctions using ab initio band structure data of the junction ferromagnets.

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Observation of Anderson Localization in an Electron Gas

Cited by 1,001 publications

References 9 publications

Promising Thermoelectric Bulk Materials with 2D Structures

Promising Thermoelectric Bulk Materials with 2D Structures

Bose–Einstein condensation of strongly correlated electrons and phonons in cuprate superconductors

Tunneling magnetothermopower in magnetic tunnel junctions

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